More AT40 Info:

Mediabase 24/7 uses
people instead of computers to identify how many times a song is played
on the radio. The Mediabase 24/7 monitors more CHR/Pop radio stations
than their competitor, BDS. Publications that use Mediabase 24/7 data
included Radio& Records. Mediabase's main website is password
restricted, but you can some information at Americas's Music Charts.

BDS
electronically
monitors radio stations and counts how many times a song is played.
This data is used by Billboard and its sister Airplay Monitor magazines
in making charts. For example, the Pop Songs chart is compiled
by counting how many times a week each song on a Top 40 mainstream
station is played. The song that is played the most is Number One. The
radio-info site has partnered with BDS to provide their charts online.

NOTE:
The stations below were the formats listed back when this page was
originally created circa 2001. They may have changed IDs
and/or formats.

This is a non-profit site, designed to educate those who have an
interest in the radio show "American Top 40". This site has no
affiliation with Premiere Radio Networks, Billboard Magazine, or Radio
and Records Magazine. The official AT40 site is at40.com All copyrights and trademarks remain property of
their respective owners.
Original artwork at the very top of this page is copyright 2001 by
Meowycats.
Comments? Send them using the feedback
page.